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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9f8afd4293095bdbaf967da3388b837ac6e3c2c32abf94cf913bcb2119fdc7' 
  AND token = 'L21DqvaEL/hU9rT82zwxSagLtBhmeHYkFi1WG/87Nqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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