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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4697a44d1ee17b69cc36fd2e0c4c153620e3564816c3bd2a83b04875c9f2a02' 
  AND token = 'HTNu0WblFWuoGsmCYYlU5eIvC3869wSR64xuk3Y+od8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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