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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f604e67932ba0ec55cb720ed189f5ed6f39e3f3104f1ed9d37b7720ba51b59' 
  AND token = 'DOTyYMI9tSi5Ypeg4543/JVhCaZs3QGM1BVro/0K3U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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