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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343ef161b658be2852a0ad40e88dbd59a513f43afb69a2c431f729cb3e10cd74' 
  AND token = 'KT7qf9ZC+ra6JlLDb+qjP9EaP9jZyARHbUX695n8ImI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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