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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650b7bed02d2cf33319343ad32cfa53535a3714e7793db39606c88f529440983' 
  AND token = '2quL/oh5xEY+QxQ598C9DtKNGJFH73M3gSX3b0aJ/vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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