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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73f2b2f642e08d30074a92a975acdf18fb3a3920eab42c63516d7b7f39902e7' 
  AND token = 'TtcupF96/w/+t+sWguezLc09ypnmDHkvMZGOpoP7MIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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