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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7942efea40160612d19d4a3f6584376056b9fd29f6d44b3590672d114fa52ed' 
  AND token = 'TG3EcyG3qK73xsjAF4pMrkAkQ6aHGao8fvvn7N9gyUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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