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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98af4989f66d5237b9359c6a8ea9394413f7896c9de2a5c07e17707aa9a21161' 
  AND token = 'HXc1lH3mX7dB77DAOLq3u5AsLJ0+kh1imwKPV9QeRlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}