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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9bc78096353e23a01ba9b133003561076d7b45ed35287fad8cda54c5536a4f' 
  AND token = 'zm5jJwjIAa6/AjaVwT6XAFoe4I+4D7OcekayVF7owUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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