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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9d2ff08ec97774c5244f479c6751d12ac5d394fc644c9dc65e2dda4f025ac2' 
  AND token = '8H4lN7RTgz1SKxrJeJ52bhexUUR4Z788SEQaA5N8KU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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