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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a6717f963378c935c0dcc40727e3d4bebe9e24380673b3064352d4f2edf3da' 
  AND token = 'zIPuiLTmwN0s2QQTzH9NMCv2YdwHBfrcJvu00FvjhA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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