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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab25a1fd1a04990e841bf26ce9b3562b6fccd3f1d9be762b4d0e023d90fd06d9' 
  AND token = 'ZgHEaBY1uFSBTYfOf22q/uiWrhQdo7f50gamPIcbHFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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