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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6eef0a7f47c1d4c3e42f2d277ba4fc897c456c57145df5ae8fca271bdbcab5' 
  AND token = 'LwO5lsd972PHusgIzYc6Mbe5HGUMlkyBj+h8FK6fsHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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