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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c4c8f628f1176195377df1fd8854a86107e0034a42938e9388bcb9bc694481' 
  AND token = 'rX/0YarQAnxQAcX7bfgz4sYml+6fR/v+knINdJkoSC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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