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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a12a2e2617e2cd6f458e3f3356bd1f7b763d6ad937932e187ad8468e800731' 
  AND token = '5wF6yy6aSoFtPCQcDZh79nDbDcqqoyEX4TMjBkSBy4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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