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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebb26ff73f4cfb881c0e3cdb2dba548f20a735952e9d501b2d1188ddfe40c2c' 
  AND token = 'fgCk7kmysorSgXQtNKi18Io4hTOKfkz2GISXm/CGy24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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