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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7681d533d42a621cf054c1d8f9a04dabea69c162ef236b6fc1864cd0cca282a3' 
  AND token = '3CsJNJu2BqpYRWqVe/o+44rs4hvSpN2qO+RBaTZHv/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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