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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbc9469cafa8338f8d235824e9dc3faf2a62ff322ed5ef51b0d9eadddb00dfe' 
  AND token = 'QuK2cZcNNEKGxLIBAO4OlfSXMEuRhWuM4C1Uc8fLu4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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