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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1fe6d20ea799e9eff1c8cc5691db312c7671c58dacb382ffebdce2ce8a88b2' 
  AND token = 'MptSwWgNetaHlOWq6MVt7upzRkudLzWX7kJFvXQZ+ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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