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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211e8ddc2619e20ac8767a4aba413863704ae7a13a785bf597369574d2579236' 
  AND token = 'XHwvwUXT+lRqMKM85duXssx0+ZboEEzV5DxM/TZ7aUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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