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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11cb73470cf96b0fc71058073997aa337ccb596fcbaa8cfd8abe7906d0f6699d' 
  AND token = 'xKB04qUfHBS8qdOGyV6Rr/ei1l58t1qDeWABD/1fyig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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