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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcdb0949bf9dea55e4594e7a4bfdf3858c844c62db4f4283f8c0a3f7757d5bc' 
  AND token = 'kkDciN0cPrrPK82Y1e0ZMnFwN87hMtMSSWYRVQoYNh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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