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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4db7df408e8c2806209632bb091978681e2212d2acddf146d15fe910592dc7d' 
  AND token = '7j8u6ii6elLkwICe7nQ3oT/dwYUEVMLFrai9FkIPzjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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