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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1125a4ad4064fe78e1c3eec5233c5cf2861ff21e693c2a87d6f5bfb7820ace1d' 
  AND token = 'YtQgoPWg4cE9LGuYi13IMI1EhKp6z8T8gl2tlZ1WPfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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