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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11661c18d4e36e4d324181e134f421ab4c864ba8f1120cdc908dd05173ac684' 
  AND token = 'wLTq92XruvlW059h9tTkPLGbPvoEI1mvcmzmbzNhHz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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