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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f26b4842dc76215740700990c203b24b35e2abde0c82764fb9ddd6883dcb0e4' 
  AND token = '0yPMvOyUWQjqnHVB8kWHtuAk0KFKx5FNnh8UfUCV1XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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