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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f974bb434d5c0a580cfcf32d7e79f61c82382837d9e6713b2f0a45a7efc54d8d' 
  AND token = 'l2KEDC0QGoLo2DrJ8+lPPDhR8yN3ctqA7t/Hsp5fT80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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