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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f820af02878d309ae42a16ce94562a5bd6ae798bccc2f1386b7007e547b38cc0' 
  AND token = 'gyE/4wTIEiqTN1BDU0ZV8o91N2Kswrf8DT18zaszgG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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