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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26581686991d067fc61ac2da1d40ade68273885aa711aac66b9a78ee39a9a6d3' 
  AND token = 'GYyT1eyuV0u9PvAMuK/Gku5H7tu/K4h7c1uRizO6yY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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