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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8eceae1f764827dd26afdbd5d6f8d6603177fedd3f1afb3d5b734014da72e94' 
  AND token = '5fTmN/YH/e/u4Css9evMfEhGrAi8vEAtTv3sOv3QL7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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