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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7298eb26b914e3509804fa749c9b7d90420b3a31c8feb0420cd6ed05822ecb' 
  AND token = '9QxyZ0SK7s0IVFjintPARVp7KdZuoYWUTyI5jThhItw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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