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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942ec9ddc8e713c3b4b503b8c51d7c98ccea0878cbad8a497f26a1b449a77c4a' 
  AND token = '3DvwEgRdh7aEXcNJrt91DnSQ9s4ANc1MHWsKOWAqh30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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