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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca433ddf1fbec0a3b6bb4f8b5aa9d76e8e2437043c9b24258ee20840bdab7c5' 
  AND token = 'Nd4zs7wzwi2UzOFFgp0oKPhRytswzwR81KLUkKlEk08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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