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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30db06138b5c9c1279cce2433254f4749e734b0c4e28de5b3b25b8a7521aeeb' 
  AND token = 'ksWuxcDZ++2f1yhTGV+y19UQl6VDAptcaUTr9TMec0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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