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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a016998850154f24df54f76ea2352885132e4522156355ac73520bb40f8ddb6' 
  AND token = 'pnWx5N8ijYkAOay6ZS9KEAd/SDsW0SHTW1fJVNs9lrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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