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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae06953b8d4a837ed7bb7ed8e91d801b23e8726cd0437060a9777fda652f144e' 
  AND token = 'TKHtFJW+0QnXycRFJ2EqJf96OWsP7+Q8PHBgNWoUaNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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