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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95c8ab4b664124cd24fdacaec10422d6a4da9dbbe10acd30c8076d7119de3dd' 
  AND token = 'tmmqCahnYw21pLGioVqo7tvmcoTrJ9jY1rgYYTWGK+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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