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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3bb65ec904a89722fd19221fd5f0ce9189acff524bc7473c4df3157e40ae9b' 
  AND token = 'eFrWjXkqp7SXu9nnn1gRu4Si470iyGFz5PJZ6bJqMy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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