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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0fd806d4a8b2ef5a7109f6fa84ac56a9e9ef3a637e98d64d7851f3ffd74c78' 
  AND token = 'xj1RNoHW/l3Sl3Ow/0Ll6gnXEXIAr1wIlO1ppBUvBbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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