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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b7fe9784909b74a71b17ae960250177a05d62b8cbf24338a792fa44a008b3e' 
  AND token = 'HLbYQb7CCGLyPzCs3d6wbwa8dTKAW25A0DV85kHRT50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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