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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11972c0f94190018bce37196c23b76ff03d28a0716cfbe3392c5c9855ee54d4e' 
  AND token = 'EP1rqyq7oRJ8OyhklEJRCylse3B2GElA7zoT5cKHR9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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