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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db888a3e832effa28884a34f2bfb010723f61a8c18a731c4d926902b279f6a7' 
  AND token = 'WRz9aZWXlzENGC1j7dtTYmtVdd4JKmY+cc+GzDrQkUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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