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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49685c59898b7f30324f4f2847fc6bf7c70c69829ffc87c6bd6f8324ea1322d' 
  AND token = 'ujRlOOPeI6xgR8sLAep9GA1ZKcKhQKZTH4MtrZ1fXtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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