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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a66b99f4ef3ac395762755b290f59fcdf8afbf59603122c91a9b2300ff4c815b' 
  AND token = 'fI4l0QpU/7BYtks2olBE118ORvFgGzCsP8jAR0tl70o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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