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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce11b8dca218a18d473e5502667d1496fec7511f3b7977041a3ef0d40c5db827' 
  AND token = 'GYQnOZUxHkvak7eCYHFZ42xl110a6eJRnGY/rIONBkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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