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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6ed52b7f4a928a1f6017996897731b3ab3646e7507b0f1381880f0094bbd13' 
  AND token = 'quCp5IJ2BoNbJD+ycYT4wN45dD3diLvsqWxOD25TC+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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