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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc6a18411d081ab8dc02481ff8703e53e92e6b8eabde68a69fd63789c705c50' 
  AND token = 'CN9AdnIG0EmdqqIf3JYaQSSVyCgfvC75bWLfZYe8S3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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