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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9baa7a919d6e6441092c977fcaa328569e1fc94e7206c28ba6ba1045bface4f4' 
  AND token = 'IGzDRKQDcWjJOJlQOz/GxihY6kkfnRhxDEXA2C74ud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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