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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357b0a2a5e30ff2c16171a3363ebd1fd245a3dd75d6b1d46b273d251437f2a9b' 
  AND token = 'Ojb8DS0plITMulGsdw+ZYfo5IjECFDTlNDR1cxkQELY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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