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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ae37e2cf98bf3e98c6a730b62348df673f13a620aca063dab4f3d1e04d85c7' 
  AND token = 'CWnmNm3d/4ZFRRrtRdZr7H4ptvHZ7zsIStmCFg9geFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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