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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba97f47456c2c05fe99871c7160b35bb0c3d185ae0419bf9ded83b6745b896f' 
  AND token = 'mxC2IIYgsqGNwwPb8mbzgyY3nce/DaoFsdc3hn0MZ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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