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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631d91b85be951661506f43216eef46249fdbac1c61a769f2ecb4cb0e8a68f9e' 
  AND token = 'Oj4nJD8IVs4uZ0/LvFPld4VRFmC9xGlSlnR21I5oEGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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