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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d8a9a505a1ef14bc52b2cdd8b14aabd2aa121634f69f43ddb3c4fb7f1c5e5d' 
  AND token = 'tt4RHDyv1znmzIkRwe4T4irtOK9arDpYAiy/HQLes2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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