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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13e3be2bbe3901f7afbe5bf4bc29799ab69951f1e16f26530b398772921bd25' 
  AND token = 'Yna5pR830cKDYXEw1MGkk1nYfug9HRbbTbNUDkODu68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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