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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e847ba4fc95e7e7a7125e81c194ac37e530385c12f1f6c35942e5961dd09b96' 
  AND token = 'VydEeoiLgzZwlWMTa7ev4C1Xf8OvrZDE+p1N1RXr5po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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