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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3b4940aa1ea401ada5c702c2102c8a4a8916fcc464a5e93494a07d590c8da4' 
  AND token = 'RIwofkp2SbHV59fMm+bRXr4YP7iXne6ST8HUqDiB68U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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