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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a56d34ac9f1995987d6c0bf3511269566a858a5e3a017787c3f22ca557a856e' 
  AND token = 'RXE0wCsGYW7tf7mKaXnUn/RqPSrJ8SUsK3/pF2g//5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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