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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc147dff1c4757ef4acdc3a312af1ed8325bae3e51c734b2a6338a9baba1917a' 
  AND token = '99rBvL1vv3qobO5lJ2dhsUhVv+Gy+TKa7j9tEyyy8cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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