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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0752cfbea6580b6594048e366178f99ad8b177a4adfce46134f758793d6f316' 
  AND token = 'SPq0Q4DWR72mxH7fTQm5kex+2a/6fiTZrZ0pGtzoaXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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