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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5704d4f430d5b919a87b78e3635d1413486a48cd5649696b3f3b6827b63e5f40' 
  AND token = 'hH5TrDCNxgdWWBcEr6N6MAWe0+Kj4qjSfXlDUOaqSVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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