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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6192b2f554d7784f780a9438006e08617f8068771858ade4c07fa349cae6dc6d' 
  AND token = 'D56yqKRaF+oHEq0z8GfCkICcTSzoJyMnGpyINyqb6hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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