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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8651dea08b44b96f7cbd236745e5561f6d3de0caa8c15b9e93a1107e859219e' 
  AND token = 'BW8mI8U972abtdTmSC/wKsHVub/qjp5ZoNZ0Hr2bvyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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