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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '340b933d6ab4e30b97f26687715ca5dfcd9de7b6c80c60dfa7064cca1bd0e205' 
  AND token = '8AwKRY9FcezHwW79nGUJQUdWveL6DFzJfOoyLkrVgfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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