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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6392c977c689adf7b924b58d09cb78579b45b961a775ab8bf50e0bbf03e77ea' 
  AND token = 'AX4jVUWH0KEIvF6JRW7vLHaDMIluZEo87fIVdAesnL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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